WO2013058542A1 - 영상 부호화/복호화 방법 및 그 장치 - Google Patents
영상 부호화/복호화 방법 및 그 장치 Download PDFInfo
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Definitions
- the present invention relates to image processing, and more particularly, to a conversion method and apparatus.
- HD images high definition (HD) images and ultra high definition (UHD) images
- UHD images ultra high definition images
- the data amount of the image data is increased. Accordingly, the transmission cost and the storage cost of the image data for providing a high resolution and high quality image are increased as compared with the conventional image data processing method.
- High efficiency image compression techniques can be used to solve these problems caused by high resolution and high quality image data.
- An entropy encoding / decoding method that performs encoding / decoding by assigning a shorter code to a signal having a higher frequency of occurrence or occurrence has been used.
- An object of the present invention is to provide an image encoding method and apparatus for improving image encoding performance.
- Another object of the present invention is to provide an image decoding method and apparatus capable of improving image decoding performance.
- Another technical problem of the present invention is to provide a conversion method and apparatus for improving image encoding performance.
- Another technical problem of the present invention is to provide an inverse transform method and apparatus for improving image decoding performance.
- Another technical problem of the present invention is to provide a scanning method and apparatus for improving image encoding performance.
- Another technical problem of the present invention is to provide an inverse scanning method and apparatus capable of improving image decoding performance.
- One embodiment of the present invention is a video decoding method.
- the method may further include receiving image information corresponding to a decoding target block, performing entropy decoding on the received image information, and based on the entropy decoded image information, among the plurality of transform skip mode candidates.
- the method may include determining a transform skip mode (TSM) of a target block and performing inverse transform on the decoding target block based on the determined transform skip mode.
- the plurality of transform skip mode candidates may include a 2D transform mode in which both horizontal transform and vertical transform are performed, a horizontal transform mode in which horizontal transform is performed, a vertical transform mode in which vertical transform is performed, and a non-conversion mode in which no transform is performed. It may include at least one of.
- the image information may include information about a prediction mode corresponding to the decoding object block and a shape of a prediction unit (PU) corresponding to the decoding object block.
- PU prediction unit
- a codeword shorter than the horizontal transform mode may be allocated to the vertical conversion mode. Can be.
- the plurality of transform skip mode candidates may be configured to exclude the vertical transform mode. It may include a 2D transform mode, the horizontal transform mode and the non-conversion mode.
- the plurality of transform skip mode candidates may be configured to exclude the horizontal transform mode. It may include a 2D conversion mode, the vertical conversion mode and the non-conversion mode.
- the transform skip mode candidate of may include the 2D transform mode, the horizontal transform mode, and the non-conversion mode except for the vertical transform mode.
- the transform skip mode candidate may include the 2D transform mode, the vertical transform mode, and the non-transform mode except the horizontal transform mode.
- the image information may include information about a prediction mode corresponding to the decoding object block and a prediction direction of a prediction unit corresponding to the decoding object block.
- a codeword shorter than the horizontal transformation mode may be allocated to the vertical conversion mode.
- the image decoding method may further include determining a scan mode for the decoding target block based on the determined transform skip mode and performing inverse scanning on the decoding target block based on the determined scan mode. Can be.
- the scan mode determining step when the determined conversion skip mode is the horizontal conversion mode, the scan mode may be determined as a vertical scan mode.
- the scan mode determining step when the determined conversion skip mode is the vertical conversion mode, the scan mode may be determined as a horizontal scan mode.
- the apparatus may further include an entropy decoding unit configured to receive image information corresponding to a decoding target block and perform entropy decoding on the received image information and the entropy decoded image information.
- the apparatus may include an inverse transform unit configured to determine a transform skip mode (TSM) of a target block and perform an inverse transform on the decoding target block based on the determined transform skip mode.
- TSM transform skip mode
- the plurality of transform skip mode candidates may include a 2D transform mode in which both horizontal transform and vertical transform are performed, a horizontal transform mode in which horizontal transform is performed, a vertical transform mode in which vertical transform is performed, and a non-conversion mode in which no transform is performed. It may include at least one of.
- the method may further include generating a residual block corresponding to an encoding target block, determining a transform skip mode of the encoding target block among a plurality of transform skip mode candidates, and based on the determined transform skip mode.
- the plurality of transform skip mode candidates may include a 2D transform mode in which both horizontal transform and vertical transform are performed, a horizontal transform mode in which horizontal transform is performed, a vertical transform mode in which vertical transform is performed, and a non-conversion mode in which no transform is performed. It may include at least one of.
- the prediction mode corresponding to the encoding target block may be an inter mode, and in the transform skip mode determination step, the transform skip mode may be determined based on the shape of the prediction unit corresponding to the encoding target block.
- the prediction mode corresponding to the encoding object block may be an SDIP mode, and in the transform skip mode determination step, the transform skip mode may be determined based on the shape of the prediction unit corresponding to the encoding object block.
- the prediction mode corresponding to the encoding object block may be an intra mode, and in the transform skip mode determination step, the transformation skip mode may be determined based on a prediction direction of the prediction unit corresponding to the encoding object block.
- the method may further include determining a scan mode for the encoding target block based on the determined transform skip mode, and performing scanning on the encoding target block based on the determined scan mode.
- the apparatus may determine a transform skip mode of the encoding target block from a residual block generator that generates a residual block corresponding to the encoding target block and a plurality of transform skip mode candidates, and based on the determined transform skip mode.
- the plurality of transform skip mode candidates may include a 2D transform mode in which both horizontal transform and vertical transform are performed, a horizontal transform mode in which horizontal transform is performed, a vertical transform mode in which vertical transform is performed, and a non-conversion mode in which no transform is performed. It may include at least one of.
- image encoding performance may be improved.
- image decoding performance can be improved.
- image encoding / decoding performance may be improved.
- image encoding / decoding performance can be improved.
- FIG. 1 is a block diagram showing a configuration of a video encoder according to an embodiment of the present invention.
- FIG. 2 is a block diagram illustrating a configuration of a video decoder according to an embodiment.
- FIG. 3 is a diagram schematically showing an embodiment of a conversion method according to a conversion mode.
- FIG. 4 is a flowchart schematically illustrating an embodiment of a conversion process in an encoder according to the present invention.
- FIG. 5 is a flowchart schematically illustrating an embodiment of an inverse transform process in a decoder according to the present invention.
- FIG. 6 is a diagram for describing a method of determining a transform skip mode candidate and a method of assigning a codeword to a transform skip mode according to a PU type in an inter mode.
- FIG. 7 is a diagram for describing a method of determining a transform skip mode candidate and a method of assigning a codeword to a transform skip mode according to a PU type in the SDIP.
- FIG. 8 is a diagram for describing a method of allocating codewords to a transform skip mode according to a prediction direction in an intra mode.
- FIG. 9 is a diagram schematically showing an embodiment of a transform coefficient scanning method according to a transform skip mode.
- FIG. 10 is a flowchart schematically illustrating an encoding method according to an embodiment of the present invention.
- FIG. 11 is a flowchart schematically illustrating a decoding method according to an embodiment of the present invention.
- each of the components in the drawings described herein are shown independently for the convenience of description regarding different characteristic functions in the image encoder / decoder, and it is understood that each of the components is implemented in separate hardware or separate software. It does not mean. For example, two or more of each configuration may be combined to form one configuration, or one configuration may be divided into a plurality of configurations. Embodiments in which each configuration is integrated and / or separated are also included in the scope of the present invention without departing from the spirit of the present invention.
- the video encoder includes a picture splitter 110, an inter predictor 120, an intra predictor 125, a transformer 130, a quantizer 135, an inverse quantizer 140, The inverse transform unit 145, the filter unit 150, the memory 155, the reordering unit 160, and the entropy encoding unit 165 may be included.
- the picture dividing unit 110 may divide the input current picture into one or more coding units.
- a coding unit is a unit in which coding is performed in a video encoder, and is hierarchically divided with depth information based on a quad tree structure. Can be.
- the CU may have various sizes such as 8 ⁇ 8, 16 ⁇ 16, 32 ⁇ 32, and 64 ⁇ 64.
- the largest size CU may be called LCU (Largest Coding Unit), and the smallest size CU may be called SCU (Smallest Coding Unit).
- the picture division unit 110 may divide a CU to generate a prediction unit (PU) or a transform unit (TU).
- the PU may be a block smaller than or equal to the CU, not necessarily square, or may be a rectangular block.
- intra prediction may be performed in blocks of 2N * 2N or N * N size.
- N is a natural number and represents the number of pixels
- 2N * 2N and N * N may represent the size (and / or division mode) of the PU.
- SDIP short distance intra prediction
- hN * 2N / 2N * hN may be used as a prediction unit size in addition to the 2N * 2N prediction unit to increase the efficiency of intra prediction.
- h 1/2).
- the prediction unit of the size of hN * 2N / 2N * hN When the prediction unit of the size of hN * 2N / 2N * hN is used, the directionality of the boundary surface in the block can be better reflected, and as a result, the energy of the prediction error signal is reduced, thereby reducing the amount of bits required for encoding, thereby encoding efficiency. This can increase.
- inter prediction may be performed in units of 2N * 2N, 2N * N, N * 2N, or N * N blocks.
- N is a natural number and represents the number of pixels
- 2N * 2N, 2N * N, N * 2N, and N * N may represent the size (and / or division mode) of the PU.
- prediction may be performed in units of prediction units of 2NxnU, 2NxnD, nLx2N, or nRx2N in addition to 2N * 2N, 2N * N, N * 2N, or N * N prediction units.
- 2NxnU, 2NxnD, nLx2N, and nRx2N may indicate the size (and / or split mode) of the PU.
- the size of the PU In split mode of 2NxnU and 2NxnD, the size of the PU may be 2Nx (1/2) N or 2Nx (3/2) N, and in split mode of nLx2N and nRx2N, the size of the PU may be (1/2) Nx2N or (3 / 2) Nx2N.
- the inter prediction unit 120 may perform motion estimation (ME) and motion compensation (MC).
- the inter prediction unit 120 may generate a prediction block based on at least one picture information of a previous picture or a subsequent picture of the current picture.
- the inter prediction unit 120 may perform motion estimation based on the divided prediction target block and at least one reference block stored in the memory unit 155.
- the inter prediction unit 120 may generate motion information including a motion vector (MV), a reference block index, and a prediction mode as a result of the motion estimation.
- MV motion vector
- reference block index a reference block index
- prediction mode a prediction mode as a result of the motion estimation.
- the inter predictor 120 may perform motion compensation using the motion information and the reference block.
- the inter prediction unit 120 may generate and output a prediction block corresponding to the input block from the reference block.
- the intra prediction unit 125 may generate a prediction block based on pixel information in the current picture.
- the intra predictor 125 may perform prediction on the current block based on the prediction target block and the reconstructed block that is previously transformed and quantized and then reconstructed.
- the reconstruction block may be a reconstructed image before passing through the filter unit 150.
- prediction of the prediction target block may be performed and a prediction block may be generated.
- the residual block may be generated by the difference between the prediction target block and the generated prediction block.
- the transformer 130 may generate transform coefficients by performing transform on the residual block for each TU.
- the TU may have a tree structure within the range of the maximum size and the minimum size. Whether a current block is divided into sub-blocks for each TU may be indicated through a flag.
- the transform unit 130 may perform a transformation based on a discrete cosine transform (DCT) and / or a discrete sine transform (DST).
- DCT discrete cosine transform
- DST discrete sine transform
- the quantizer 135 may quantize the values converted by the transformer 130.
- the quantization coefficient may change depending on the block or the importance of the image.
- the quantized transform coefficient values may be provided to the reordering unit 160 and the inverse quantization unit 140.
- the reordering unit 160 may align the transform coefficients of the quantized 2D block type into the transform coefficients of the 1D vector form through a scan in order to increase the efficiency of entropy encoding. In this case, the reordering unit 160 may increase the entropy coding efficiency by changing the scanning order based on the probabilistic statistics.
- the entropy encoder 165 may entropy encode the values obtained by the reordering unit 160. In the entropy encoding process, a smaller number of codewords may be allocated to a syntax element value having a high frequency, and a larger number of codewords may be allocated to a syntax element value having a low frequency of occurrence. Accordingly, the size of the bit string for the symbols to be encoded may be reduced, thereby improving image encoding compression performance.
- coding methods such as exponential golomb, context-adaptive variable length coding (CAVLC), and / or context-adaptive binary arithmetic coding (CABAC) may be used.
- CABAC context-adaptive binary arithmetic coding
- the encoded information forms a compressed bit stream and may be transmitted or stored through a network abstraction layer (NAL).
- NAL network abstraction layer
- the inverse quantizer 140 may inverse quantize transform coefficients quantized by the quantizer 135, and the inverse transformer 145 may inverse transform the inverse quantized transform coefficients to generate a reconstructed residual block.
- the reconstructed residual block may be combined with the predicted block generated by the inter predictor 120 or the intra predictor 125 to generate a reconstructed block.
- the reconstruction block may be provided to the intra predictor 125 and the filter 150.
- the filter unit 150 may apply a deblocking filter, a sample adaptive offset (SAO), and / or an adaptive loop filter (ALF) to the reconstructed residual block.
- the deblocking filter may filter the reconstructed block to remove distortion between block boundaries occurring in the encoding and decoding process.
- SAO is a loop filter process that restores the offset difference from the original image on a pixel-by-pixel basis for the residual block to which the deblocking filter is applied. Offsets applied through the SAO may include a band offset, an edge offset, and the like.
- the band offset may divide the pixel into 32 bands according to intensity, and apply the offset by dividing the 32 bands into two band groups of 16 bands at the edge and 16 bands at the center.
- the ALF may perform filtering to minimize an error between the predicted block and the last reconstructed block.
- the ALF may perform filtering based on a value obtained by comparing a reconstructed block filtered through a deblocking filter with a current predicted block, and the filter coefficient information of the ALF is included in a slice header and transmitted from the encoder to the decoder. Can be.
- the memory 155 may store a final reconstructed block that has passed through the filter unit 150, and the stored final reconstructed block may be provided to the inter predictor 120 that performs inter prediction.
- the video decoder includes an entropy decoder 210, a reordering unit 215, an inverse quantizer 220, an inverse transform unit 225, an inter predictor 230, an intra predictor 235, and a filter.
- the unit 240 and the memory 245 may be included.
- the entropy decoder 210 may receive a compressed bit stream from the NAL.
- the entropy decoder 210 may entropy decode the received bit stream, and entropy decode the prediction bit, motion vector information, and the like when the bit stream is included in the bit stream.
- fewer bits of codewords may be allocated to syntax element values having a high frequency, and more bits of codewords may be allocated to syntax element values with a low frequency of occurrence. Therefore, the size of the bit string for the symbols to be encoded may be reduced, thereby improving image decoding performance.
- the entropy decoded transform coefficient or residual signal may be provided to the reordering unit 215.
- the reordering unit 215 may inverse scan the decoded transform coefficients or the residual signal to generate transform coefficients in the form of a 2D block.
- the inverse quantization unit 220 may inverse quantize the rearranged transform coefficients.
- the inverse transform unit 225 may inverse transform the inverse quantized transform coefficients to generate a residual block.
- the residual block may be combined with the prediction block generated by the inter predictor 230 or the intra predictor 235 to generate a reconstructed block.
- the reconstruction block may be provided to the intra predictor 235 and the filter 240. Since the operations of the inter predictor 230 and the intra predictor 235 are the same as or similar to the operations of the inter predictor 120 and the intra predictor 125 in the video encoder, they will be omitted here.
- the filter unit 240 may apply a deblocking filter, SAO and / or ALF to the reconstruction block.
- the deblocking filter may filter the reconstructed block to remove distortion between block boundaries occurring in the encoding and decoding process.
- SAO is applied to the deblocking filtered reconstructed block on a pixel basis to reduce the difference from the original image.
- the ALF may perform filtering on the reconstructed block on which the SAO process is performed in order to minimize an error between the prediction target block and the last reconstructed block.
- the memory 245 may store a final reconstruction block obtained through the filter unit 240, and the stored final reconstruction block may be provided to the inter prediction unit 230 that performs inter prediction.
- a block may mean a unit of image encoding and decoding. Accordingly, in the present specification, a block may mean a coding unit (CU), a prediction unit (PU), a transform unit (TU), or the like, in some cases.
- the encoding / decoding object block may be used in the present specification to include both a transform / inverse transform object block when the transform / inverse transform is performed and a predictive block when prediction is performed.
- the encoder may perform transform on the residual block for each TU, and the decoder may generate the reconstructed residual block by inverse transforming the inverse quantized transform coefficients.
- an inverse transform may be referred to as a 'transformation', and such division may be easily performed by those skilled in the art.
- the encoder and the decoder may perform a 2D transform including both a vertical transform and a horizontal transform.
- the vertical conversion or the horizontal conversion may be omitted, and the entire conversion process may be omitted for the sparse signal. This conversion method can reduce the complexity in the decoder and can improve the coding efficiency.
- a conversion mode in which both horizontal transformation and vertical transformation are performed is referred to as a '2D transformation mode'.
- a transformation mode in which vertical transformation is omitted and only horizontal transformation is performed is referred to as a "horizontal transformation mode”
- a transformation mode in which horizontal transformation is omitted and only vertical transformation is performed is referred to as a "vertical transformation mode”.
- a conversion mode in which both horizontal and vertical conversions are omitted is called a "non-conversion mode.”
- the 'non-transform mode' may also be referred to as 'transform bypass mode'.
- FIG. 3 is a diagram schematically showing an embodiment of a conversion method according to a conversion mode.
- the square blocks shown in each of 310 to 340 of FIG. 3 represent a conversion target block.
- the transform target block may correspond to a TU and / or a CU.
- arrows illustrated in each of 310 to 330 of FIG. 3 may indicate a conversion direction.
- both the vertical transform and the horizontal transform may be performed on the transform target block. Therefore, the conversion mode illustrated in 310 of FIG. 3 may correspond to a 2D conversion mode.
- the vertical transformation may be omitted and only the horizontal transformation may be performed.
- the conversion mode illustrated in 320 of FIG. 3 may correspond to a horizontal conversion mode. In this case, since the transformation is performed on a row rather than a column, the transformation method in the horizontal transformation mode may also be referred to as 'transform on rows only'.
- horizontal transformation may be omitted and only vertical transformation may be performed. Therefore, the conversion mode illustrated in 330 of FIG. 3 may correspond to the vertical conversion mode.
- the transformation method in the vertical transformation mode may also be referred to as 'transform on rows only'.
- the transform may not be performed on the transform target block. Accordingly, the conversion mode illustrated at 340 of FIG. 3 may correspond to a non-conversion mode.
- each of the above-described conversion modes may be referred to as a Transfrom Skip Mode (TSM). That is, the transform skip mode may include a 2D transform mode, a horizontal transform mode, a vertical transform mode, and a non-conversion mode. Therefore, the 2D transform mode, the horizontal transform mode, the vertical transform mode, and / or the non-transform mode may be used as a transform skip mode candidate for the transform target block.
- TSM Transfrom Skip Mode
- At least one of the 2D transform mode, the horizontal transform mode, the vertical transform mode, and the non-transform mode may be used as a transform skip mode candidate for the transform target block.
- one transform skip mode selected from a plurality of transform skip mode candidates may be applied to one transform target block.
- the encoder may select a transform skip mode having the smallest cost value in terms of rate-distortion optimization among a plurality of transform skip mode candidates.
- the encoder may perform transform on the transform target block based on the selected transform skip mode. That is, the encoder may apply one of the 2D transform mode, the horizontal transform mode, the vertical transform mode, and the non-transform mode to the transform target block according to the selected transform skip mode.
- the encoder may encode information about the selected transform skip mode and transmit the encoded information to the decoder.
- the transform skip mode may be determined in units of CUs or in units of TUs. In this case, when the transform skip mode is determined in CU units, the information may be transmitted in CU units. When the transform skip mode is determined in TU units, the information may be transmitted in units of TUs.
- the information about the transform skip mode may be transmitted to the decoder through a transform skip mode index.
- the transform skip mode index may mean an index indicating a transform skip mode applied to the transform target block among transform skip mode candidates.
- the transform skip mode index may be assigned an index value according to the transform skip mode.
- the 2D transform mode, the horizontal transform mode, the vertical transform mode, and the non-conversion mode may correspond to different index values.
- the decoder may receive and decode information about a transform skip mode (eg, an encoded transform skip mode index) from the encoder.
- the decoder may derive the transform skip mode applied to the transform target block based on the decoded information.
- the decoder may perform transform on the transform target block based on the derived transform skip mode. That is, the decoder may apply one of the 2D transform mode, the horizontal transform mode, the vertical transform mode, and the non-transform mode to the transform target block according to the derived transform skip mode.
- FIG. 4 is a flowchart schematically illustrating an embodiment of a conversion process in an encoder according to the present invention.
- the encoder may determine a transform skip mode for a transform target block among a plurality of transform skip mode candidates (S410).
- the plurality of transform skip mode candidates may be at least one of a 2D transform mode, a horizontal transform mode, a vertical transform mode, and a non-conversion mode.
- the encoder may select a transform skip mode having the smallest cost value in terms of rate-distortion optimization among the plurality of transform skip mode candidates.
- a specific embodiment of a method of determining a transform skip mode candidate will be described later.
- the encoder may perform transform on the transform target block based on the determined transform skip mode (S420). That is, the encoder may apply one of the 2D transform mode, the horizontal transform mode, the vertical transform mode, and the non-transform mode to the transform target block according to the selected transform skip mode.
- the encoder may encode information about a transform skip mode applied to the transform target block and transmit the encoded information to the decoder.
- the information may be transmitted to the decoder through a transform skip mode index.
- the encoder may allocate a short codeword to a transform skip mode with a high frequency of occurrence and a long codeword to a transform skip mode with a low frequency of occurrence, in consideration of the occurrence probability of the transform skip mode. A specific embodiment of the method for allocating a codeword in the transform skip mode will be described later.
- FIG. 5 is a flowchart schematically illustrating an embodiment of an inverse transform process in a decoder according to the present invention.
- the decoder may receive and decode a bitstream including information about a transform skip mode (eg, an encoded transform skip mode index) from the encoder.
- a transform skip mode eg, an encoded transform skip mode index
- a short codeword may be assigned to a transform skip mode with a high frequency of occurrence
- a long codeword may be assigned to a transform skip mode with a low frequency of occurrence.
- the decoder may derive a transform skip mode for an inverse transform target block from among a plurality of transform skip mode candidates (S510).
- the plurality of transform skip mode candidates may be at least one of a 2D transform mode, a horizontal transform mode, a vertical transform mode, and a non-conversion mode.
- the decoder can also use the same transform skip mode candidate as in the encoder.
- the decoder may derive the transform skip mode for the inverse transform target block based on the decoded information (information about the transform skip mode. For example, the decoded transform skip mode index).
- the decoded information information about the transform skip mode. For example, the decoded transform skip mode index.
- the decoder may perform inverse transform on the inverse transform target block based on the derived transform skip mode (S520). That is, the decoder may apply one of the 2D transform mode, the horizontal transform mode, the vertical transform mode, and the non-transform mode to the inverse transform target block according to the selected transform skip mode.
- the encoder and the decoder may use all of the 2D transform mode, the horizontal transform mode, the vertical transform mode, and the non-transform mode as the transform skip mode candidates.
- 2D transform mode and / or transform skip mode index corresponding to 2D transform mode
- horizontal transform mode and / or transform skip mode index corresponding to horizontal transform mode
- vertical transform mode and / or vertical transform
- Different codewords may be assigned to the transform skip mode index corresponding to the mode and the non-converted mode (and / or the transform skip mode index corresponding to the non-converted mode).
- the encoder may allocate a short codeword to a transform skip mode with a high frequency of occurrence and a long codeword to a transform skip mode with a low frequency of occurrence, in consideration of the occurrence probability of the transform skip mode as described above.
- Table 1 below shows an embodiment of a method of allocating codewords to a transform skip mode.
- TS0 represents a 2D conversion mode.
- TS1 indicates a horizontal conversion mode and TS2 indicates a vertical conversion mode.
- TS3 represents the non-conversion mode.
- the horizontal transformation mode and the vertical transformation mode may correspond to the 1D transformation mode.
- the codeword '1' may be assigned to the 2D conversion mode.
- the codeword '01' is allocated to the horizontal conversion mode
- the codeword '001' is assigned to the vertical conversion mode
- the codeword '000' is assigned to the non-transformation mode according to the frequency of occurrence.
- the quantization matrix may be applied in the same manner as in the 2D transform mode.
- the encoder and the decoder may perform scaling on the values of the rows and / or columns in which the transformation is omitted, which may be represented by Equation 1 below.
- x may mean a value of an element present in a row and / or a column in which a transformation is omitted
- y may mean a scaled value.
- scaling may indicate a scaling factor.
- 'Offset' may indicate an offset value applied in the scaling process
- 'shift' may indicate a bit shift value applied in the scaling process.
- 'offset' and 'shift' may each have the same value as the offset value and the bit shift value applied when the transformation is not omitted (for example, in the 2D transformation mode).
- the scaling factor applied to the encoder and the decoder may be a value determined depending on the size of the TU.
- the scaling factor value according to the size of the TU may be set as shown in Table 2 as an embodiment.
- N (and / or N ⁇ N) may indicate the size of the TU
- scale may indicate a scaling factor.
- the scaling factor value applied when the size of the TU is 8x8 may be 181.
- the PU is not necessarily square, but may be a rectangular block.
- the PU in the inter mode, may have a size (and / or shape) of 2N * N, N * 2N, 2NxnU, 2NxnD, nLx2N or nRx2N.
- the PU when SDIP is applied, may have a size (and / or shape) of 2N * (1/2) N, (1/2) N * 2N.
- the encoder and the decoder may improve encoding / decoding performance by not using a transform skip mode having a small probability of occurrence as a transform skip mode candidate.
- the encoder may improve encoding / decoding performance by allocating a short codeword to a transform skip mode having a low probability of occurrence. Accordingly, a method of determining a transform skip mode candidate according to the size (and / or shape) of a PU and a method of assigning a codeword to the transform skip mode according to the size (and / or shape) of a PU may be provided.
- FIG. 6 is a diagram for describing a method of determining a transform skip mode candidate and a method of assigning a codeword to a transform skip mode according to a PU type in an inter mode.
- FIG. 6 schematically illustrates the size (and / or shape) of a PU in inter mode.
- one coding unit 610 may be divided into PUs having different sizes according to characteristics of an image.
- 6 is a diagram illustrating a case where inter prediction is performed and shows that one coding unit 610 is divided into a plurality of PUs 620.
- the size (and / or shape) of the PU in the inter mode is 2N * 2N 621, 2N * N 622, N * 2N 623, N * N 624, 2NxnU 625, and 2NxnD 626, respectively.
- nLx2N 627 or nRx2N 628 the N * N 624 size (and / or shape) PU may be used only in the SCU, which is a minimum coding unit, in order to prevent calculation duplication for calculating the prediction cost.
- the occurrence probability of the horizontal transform mode and the vertical transform mode in the inter mode may vary depending on the shape of the PU. Accordingly, the codewords allocated to the transform skip mode (and / or the transform skip mode index) may be determined differently according to the type of the PU. That is, codewords allocated to the transform skip mode (and / or the transform skip mode index) may be determined based on the type of the PU.
- the energy compaction effect of the horizontal transformation may be smaller than the energy compression effect of the vertical transformation. Therefore, in this case, the occurrence probability of the vertical transformation mode may be higher than the occurrence probability of the horizontal transformation mode.
- Table 1 shows an embodiment of a method of allocating codewords to a transform skip mode when the PU is N * 2N 623.
- TS0 represents the 2D conversion mode.
- TS1 indicates a horizontal conversion mode and TS2 indicates a vertical conversion mode.
- TS3 represents the non-conversion mode.
- the horizontal transformation mode and the vertical transformation mode may correspond to the 1D transformation mode.
- the codeword '001' may be allocated to the horizontal transformation mode and the codeword '01' may be allocated to the vertical transformation mode.
- the shape of the PU is N * 2N 623
- a codeword shorter than the horizontal transform mode may be assigned to the vertical transform mode. Can be.
- the present invention is not limited thereto.
- the shape of the PU is N * 2N 623 as well as the nLx2N 627 or nRx2N 628
- the occurrence probability of the vertical transform mode may be higher than that of the horizontal transform mode. Therefore, even in this case, a codeword shorter than the horizontal conversion mode may be allocated to the vertical conversion mode.
- the probability of occurrence of the horizontal transform mode may be higher than the probability of occurrence of the vertical transform mode. Therefore, in this case, a codeword shorter than the vertical transformation mode may be allocated to the horizontal transformation mode.
- the type of PU is 2N * N 622, 2NxnU 625, and 2NxnD 626, the same codeword allocation scheme as in the embodiment of Table 1 may be used.
- the number of transform skip mode candidates may be determined differently according to the type of the PU. That is, the transform skip mode candidate for the transform target block may be determined based on the shape of the PU corresponding to the transform target block.
- the shape of the PU when the shape of the PU is 2N * N 622, since the energy compression effect of the vertical transform is smaller than the energy compression effect of the horizontal transform, the probability of occurrence of the vertical transform mode is higher than that of the horizontal transform mode. Can be small. Therefore, when the shape of the PU is 2N * N 622, 2D transform mode, horizontal transform mode and non-transform mode except the vertical transform mode may be used as transform skip mode candidates for the transform target block.
- the transform skip mode applied to the transform target block may be one of a 2D transform mode, a horizontal transform mode, and a non-conversion mode. Table 4 below shows an embodiment of a method of allocating codewords to a transform skip mode when the 2D transform mode, the horizontal transform mode, and the non-transform mode are used as transform skip mode candidates.
- TS0 represents a 2D conversion mode
- TS1 represents a horizontal conversion mode
- TS3 represents a non-conversion mode.
- the horizontal transformation mode may correspond to the 1D transformation mode.
- the 2D transform mode, the horizontal transform mode, and the non-transform mode may be used as the transform skip mode candidates.
- Table 4 described above has been described based on the case where the shape of the PU is 2N * N (622), the present invention is not limited thereto.
- the probability of occurrence of the vertical transform mode may be smaller than that of the horizontal transform mode. Therefore, even in this case, 2D transform mode, horizontal transform mode, and non-transform mode except vertical transform mode may be used as transform skip mode candidates for the transform target block.
- the shape of the PU when the shape of the PU is N * 2N 623, since the energy compression effect of the horizontal transform is smaller than the energy compression effect of the vertical transform, the probability of occurrence of the horizontal transform mode is higher than that of the vertical transform mode. Can be small. Therefore, when the shape of the PU is N * 2N 623, the 2D transform mode, the vertical transform mode, and the non-transform mode except for the horizontal transform mode may be used as transform skip mode candidates for the transform target block.
- the transform skip mode applied to the transform target block may be one of a 2D transform mode, a vertical transform mode, and a non-conversion mode. Table 5 below shows an embodiment of a method of allocating codewords to a transform skip mode when a 2D transform mode, a vertical transform mode, and a non-transform mode are used as transform skip mode candidates.
- TS0 represents a 2D conversion mode
- TS2 represents a vertical conversion mode
- TS3 represents a non-conversion mode
- the vertical transformation mode may correspond to the 1D transformation mode.
- the 2D transform mode, the vertical transform mode, and the non-conversion mode may be used as the transform skip mode candidates.
- the present invention is not limited thereto.
- the shape of the PU is N * 2N 623 as well as the nLx2N 627 or nRx2N 628
- the occurrence probability of the horizontal transform mode may be smaller than that of the vertical transform mode. Therefore, even in this case, the 2D transform mode, the vertical transform mode, and the non-transform mode except for the horizontal transform mode may be used as the transform skip mode candidates for the transform target block.
- the number of bits used for encoding a transform skip mode (and / or a transform skip mode index) may be reduced. Therefore, the encoding / decoding performance can be improved.
- FIG. 7 is a diagram for describing a method of determining a transform skip mode candidate and a method of assigning a codeword to a transform skip mode according to a PU type in the SDIP.
- FIG. 7 schematically illustrates the size (and / or shape) of a PU in SDIP.
- one coding unit 710 may be divided into PUs having different sizes according to characteristics of an image.
- FIG. 7 is a diagram illustrating a case where SDIP is applied and shows that one coding unit 710 is divided into a plurality of PUs 720.
- the size (and / or shape) of the PU in SDIP is 2N * 2N (721), N * N (723), (1/2) N * 2N (725) or 2N * (1/2) N (727), respectively.
- a PU of size N * N 723 (and / or shape) may be used only in an SCU that is a minimum coding unit in order to prevent duplication of calculation for calculating a prediction cost.
- the number of transform skip mode candidates may be determined differently according to the type of the PU. That is, the transform skip mode candidate for the transform target block may be determined based on the shape of the PU corresponding to the transform target block.
- the shape of the PU when the shape of the PU is 2N * (1/2) N 727, since the energy compression effect of the vertical transform is smaller than the energy compression effect of the horizontal transform, the probability of occurrence of the vertical transform mode is horizontal. It may be less than the probability of occurrence of the mode. Therefore, when the shape of the PU is 2N * (1/2) N 727, the 2D transform mode, the horizontal transform mode, and the non-transform mode except for the vertical transform mode may be used as transform skip mode candidates for the transform target block. have.
- the transform skip mode applied to the transform target block may be one of a 2D transform mode, a horizontal transform mode, and a non-conversion mode.
- the 2D transform mode, the horizontal transform mode, and the non-transform mode are used as the transform skip mode candidates, embodiments of the method for allocating codewords to the transform skip mode have been described above in Table 4, and thus descriptions thereof will be omitted.
- the shape of the PU is (1/2) N * 2N 725
- the probability of occurrence of the horizontal transform mode is vertical. It may be less than the probability of occurrence of the mode. Therefore, when the shape of the PU is (1/2) N * 2N (725), 2D transform mode, vertical transform mode, and non-transform mode except the horizontal transform mode may be used as transform skip mode candidates for the transform target block.
- the transform skip mode applied to the transform target block may be one of a 2D transform mode, a vertical transform mode, and a non-conversion mode.
- the 2D transform mode, the vertical transform mode, and the non-transform mode are used as transform skip mode candidates, embodiments of a method of allocating codewords to the transform skip mode have been described above in Table 5, and thus descriptions thereof will be omitted.
- the number of bits used for encoding a transform skip mode (and / or a transform skip mode index) may be reduced. Therefore, the encoding / decoding performance can be improved.
- FIG. 8 is a diagram for describing a method of allocating codewords to a transform skip mode according to a prediction direction in an intra mode.
- the encoder and the decoder may generate a prediction block by performing intra prediction based on pixel information in the current picture.
- Intra prediction may be performed according to the intra prediction mode of the prediction target block.
- the intra prediction mode may include a DC mode, a planar mode, a vertical mode, a horizontal mode, an angular mode, and the like.
- DC mode and planner mode are non-directional modes, and the other modes are directional modes.
- the angular mode may mean a directional prediction mode except for the vertical mode and the horizontal mode.
- each intra prediction mode has a different prediction direction.
- the number assigned to each intra prediction mode may be referred to as a mode value.
- an intra prediction mode having a mode value of 0 may be called a planner mode.
- planner mode reference pixels to be used for prediction of pixel values of the prediction pixel may be determined based on the position of the prediction pixel located in the prediction block, and the prediction value of the prediction pixel may be derived based on the determined reference pixel. Can be.
- the mode value is 1, it may be called a DC mode, and a prediction block may be generated by an average of pixel values of pixels located around the prediction target block.
- the mode value is 26
- prediction may be performed in the vertical direction based on pixel values of neighboring blocks. Therefore, the intra prediction mode having the mode value of 26 may also be called a vertical mode.
- the prediction may be performed in the horizontal direction based on the pixel values of the neighboring blocks. Therefore, the intra prediction mode having the mode value of 10 may also be called a horizontal mode. In the other modes, prediction may be performed based on pixel values of neighboring blocks according to the corresponding angles.
- the occurrence probability of the horizontal transform mode and the vertical transform mode may vary depending on the intra prediction mode (and / or the prediction direction) of the PU corresponding to the transform target block. Therefore, the codewords allocated to the transform skip mode (and / or transform skip mode index) according to the intra prediction mode (and / or prediction direction) of the PU may be determined differently. That is, the codeword assigned to the transform skip mode (and / or transform skip mode index) may be determined based on the intra prediction mode (and / or prediction direction) of the PU corresponding to the transform target block.
- the energy compression effect of the horizontal transform may be smaller than the energy compression effect of the vertical transform. Therefore, in this case, the occurrence probability of the vertical transformation mode may be higher than the occurrence probability of the horizontal transformation mode.
- Table 1 since a codeword of '01' is assigned to the horizontal transform mode and a codeword of '001' is assigned to the vertical transform mode, a longer codeword is assigned to the transform skip mode with a high probability of occurrence. do. Therefore, when the intra prediction mode of the PU is the vertical mode, the coding performance can be improved by resetting the codewords allocated to the horizontal transform mode and the codewords allocated to the vertical transform mode.
- the intra prediction mode of the PU is the vertical mode
- the probability of occurrence of the vertical transform mode may be higher than that of the horizontal transform mode, and thus a codeword shorter than the horizontal transform mode may be allocated to the vertical transform mode. Since an embodiment in which a codeword shorter than the horizontal transform mode is allocated to the vertical transform mode is similar to that in the embodiment of Table 3, it will be omitted here.
- the intra prediction mode of the PU corresponding to the transform target block is the horizontal mode
- the occurrence probability of the horizontal transform mode may be higher than that of the vertical transform mode. Therefore, in this case, a codeword shorter than the vertical transformation mode may be allocated to the horizontal transformation mode.
- the same codeword allocation scheme as in the embodiment of Table 1 may be used.
- FIG. 9 is a diagram schematically showing an embodiment of a transform coefficient scanning method according to a transform skip mode.
- FIG. 9 illustrates an embodiment of a horizontal scan 910 method, a vertical scan 920 method, and a zigzag scan 930 method. Although only the scanning method (and / or scan order) for the 4x4 block is shown in FIG. 9, the present invention is not limited thereto and may be applied regardless of the size of the block.
- reverse scanning may be referred to as 'scanning' in some cases for convenience of description. Such division may be easily made by those skilled in the art.
- the encoder may perform the scanning to sort the transform coefficients in the form of a quantized two-dimensional block into transform coefficients in the form of a one-dimensional vector.
- the decoder may generate transform coefficients in the form of a 2D block by scanning the transform coefficients in the form of a decoded 1D vector.
- the encoder and the decoder may determine the scanning method (and / or scanning order) based on the transform skip mode. That is, according to an embodiment of the present invention, a scanning method (and / or scanning order) may be applied differently according to a transform skip mode for a transform target block.
- a vertical scan method 920 may be applied to the transform target block.
- the conversion skip mode is the vertical conversion mode
- FIG. 10 is a flowchart schematically illustrating an encoding method according to an embodiment of the present invention.
- the encoder may generate a residual block corresponding to the current block (S1010).
- the encoder may generate a prediction block corresponding to the current block by performing inter prediction and / or intra prediction on the current block.
- the encoder may generate a residual signal, that is, a residual block by dividing the pixel value of the current block and the pixel value of the prediction block in units of pixels.
- the encoder may perform transform on the residual signal, that is, the residual block (S1020).
- the encoder can transform code the residual signal by applying a transform kernel, and the size of the transform code kernel can be 2 * 2, 4 * 4, 8 * 8, 16 * 16, 32 * 32, or 64 * 64. have.
- the transform coefficient C for the n * n block may be calculated by Equation 2 below.
- C (n, n) is a matrix of n * n transform coefficients
- T (n, n) is an n * n transform kernel matrix
- B (n, n) is n * n magnitude Matrix for the residual block.
- the encoder may perform quantization on the generated transform coefficients.
- the encoder can compare the cost function before and after the transform encoding, and can select a method of minimizing the cost. In this case, the encoder may transmit information on the type (residual signal or transform coefficient) of a signal transmitted for the current block to the decoding apparatus.
- the encoder may perform scanning on transform coefficients (S1030).
- the encoder may determine the scanning method (and / or scan order) based on the transform skip mode. Since a specific embodiment of the method of determining the scan order based on the transform skip mode has been described above, a description thereof will be omitted.
- the encoder may perform entropy encoding on the scanned transform coefficients and the auxiliary information (eg, inter prediction mode information of the current block) (S1040).
- the coded information forms a compressed bitstream and may be transmitted or stored through a network abstraction layer (NAL).
- NAL network abstraction layer
- the encoding method is described based on a flowchart as a series of steps, but the present invention is not limited thereto. Some steps in the embodiment of FIG. 10 may occur in a different order or in parallel with other steps than described above. In addition, other steps may be included in the steps shown in the flowchart, and one or more steps in the flowchart of FIG. 10 may be deleted without affecting the scope of the present invention.
- FIG. 11 is a flowchart schematically illustrating a decoding method according to an embodiment of the present invention.
- the decoder may perform entropy decoding on the bitstream received from the encoder (S1110).
- the decoder may derive the prediction mode and the residual signal of the current block based on a variable length coding (VLC) table and / or CABAC.
- VLC variable length coding
- CABAC CABAC
- the decoder can obtain information on whether the received signal for the current block is a residual signal or a transform coefficient, and obtain a transform signal in the form of a residual signal or a one-dimensional vector for the current block. If the received bitstream includes side information necessary for decoding, they may be entropy decoded together.
- the decoder may generate a 2D block by performing inverse scanning on the entropy decoded residual signal or transform coefficient (S1120).
- a residual block may be generated in the case of the residual signal
- a transform coefficient in the form of a 2D block may be generated in the case of the transform coefficient.
- the decoder may perform inverse quantization on the generated transform coefficients.
- the decoder may determine a scanning method (and / or scan order) based on the transform skip mode. Since a specific embodiment of the method of determining the scan order based on the transform skip mode has been described above, a description thereof will be omitted.
- the decoder may generate a residual block by performing inverse transform on the inverse quantized transform coefficients (S1130).
- the inverse transformation process can be represented by the following equation (3).
- the decoder may generate a reconstruction block based on the generated residual block (S1140). As described above, the decoder may generate a prediction block corresponding to the decoding object block by performing inter prediction and / or intra prediction on the decoding object block. In this case, the decoder may generate a reconstruction block by adding the pixel value of the prediction block and the pixel value of the residual block in units of pixels.
- the decoding method is described based on a flowchart as a series of steps, but the present invention is not limited thereto. In the embodiment of FIG. 11, some steps may occur in a different order or in parallel with other steps than described above. In addition, other steps may be included in the steps shown in the flowchart, and one or more steps in the flowchart of FIG. 11 may be deleted without affecting the scope of the present invention.
Abstract
Description
Claims (19)
- 복호화 대상 블록에 대응하는 영상 정보를 수신하는 단계;
상기 수신된 영상 정보에 대해 엔트로피 복호화를 수행하는 단계;
상기 엔트로피 복호화된 영상 정보를 기반으로, 복수의 변환 스킵 모드 후보 중에서 상기 복호화 대상 블록의 변환 스킵 모드(Transform Skip Mode: TSM)를 결정하는 단계; 및
상기 결정된 변환 스킵 모드를 기반으로 상기 복호화 대상 블록에 대한 역변환을 수행하는 단계를 포함하되,
상기 복수의 변환 스킵 모드 후보는,
수평 변환과 수직 변환이 모두 수행되는 2D 변환 모드, 수평 변환이 수행되는 수평 변환 모드, 수직 변환이 수행되는 수직 변환 모드 및 변환이 수행되지 않는 비변환 모드 중에서 적어도 하나를 포함하는 것을 특징으로 하는 영상 복호화 방법. - 제 1항에 있어서,
상기 영상 정보는,
상기 복호화 대상 블록에 대응되는 예측 모드 및 상기 복호화 대상 블록에 대응되는 예측 유닛(Prediction Unit: PU)의 형태에 관한 정보를 포함하는 것을 특징으로 하는 영상 복호화 방법. - 제 2항에 있어서,
상기 복호화 대상 블록에 대응되는 예측 모드가 인터 모드이고 상기 복호화 대상 블록에 대응되는 예측 유닛의 형태가 Nx2N(N은 자연수)인 경우,
상기 수직 변환 모드에는 상기 수평 변환 모드보다 짧은 코드워드가 할당되는 것을 특징으로 하는 영상 복호화 방법. - 제 2항에 있어서,
상기 복호화 대상 블록에 대응되는 예측 모드가 인터 모드이고 상기 복호화 대상 블록에 대응되는 예측 유닛의 형태가 2NxN(N은 자연수)인 경우,
상기 복수의 변환 스킵 모드 후보는,
상기 수직 변환 모드를 제외한 상기 2D 변환 모드, 상기 수평 변환 모드 및 상기 비변환 모드를 포함하는 것을 특징으로 하는 영상 복호화 방법. - 제 2항에 있어서,
상기 복호화 대상 블록에 대응되는 예측 모드가 인터 모드이고 상기 복호화 대상 블록에 대응되는 예측 유닛의 형태가 Nx2N(N은 자연수)인 경우,
상기 복수의 변환 스킵 모드 후보는,
상기 수평 변환 모드를 제외한 상기 2D 변환 모드, 상기 수직 변환 모드 및 상기 비변환 모드를 포함하는 것을 특징으로 하는 영상 복호화 방법. - 제 2항에 있어서,
상기 복호화 대상 블록에 대응되는 예측 모드가 SDIP(Short Distance Intra Prediction) 모드이고 상기 복호화 대상 블록에 대응되는 예측 유닛의 형태가 2Nx(1/2)N(N은 2 이상의 자연수)인 경우,
상기 복수의 변환 스킵 모드 후보는,
상기 수직 변환 모드를 제외한 상기 2D 변환 모드, 상기 수평 변환 모드 및 상기 비변환 모드를 포함하는 것을 특징으로 하는 영상 복호화 방법. - 제 2항에 있어서,
상기 복호화 대상 블록에 대응되는 예측 모드가 SDIP(Short Distance Intra Prediction) 모드이고 상기 복호화 대상 블록에 대응되는 예측 유닛의 형태가 (1/2)Nx2N(N은 2 이상의 자연수)인 경우,
상기 복수의 변환 스킵 모드 후보는,
상기 수평 변환 모드를 제외한 상기 2D 변환 모드, 상기 수직 변환 모드 및 상기 비변환 모드를 포함하는 것을 특징으로 하는 영상 복호화 방법. - 제 1항에 있어서,
상기 영상 정보는,
상기 복호화 대상 블록에 대응되는 예측 모드 및 상기 복호화 대상 블록에 대응되는 예측 유닛의 예측 방향에 관한 정보를 포함하는 것을 특징으로 하는 영상 복호화 방법. - 제 8항에 있어서,
상기 복호화 대상 블록에 대응되는 예측 모드가 인트라 모드이고 상기 복호화 대상 블록에 대응되는 예측 유닛의 예측 방향이 수직 방향인 경우,
상기 수직 변환 모드에는 상기 수평 변환 모드보다 짧은 코드워드가 할당되는 것을 특징으로 하는 영상 복호화 방법. - 제 1항에 있어서,
상기 결정된 변환 스킵 모드를 기반으로 상기 복호화 대상 블록에 대한 스캔 모드를 결정하는 단계; 및
상기 결정된 스캔 모드를 기반으로 상기 복호화 대상 블록에 대한 역스캐닝을 수행하는 단계를 더 포함하는 것을 특징으로 하는 영상 복호화 방법. - 제 10항에 있어서,
상기 스캔 모드 결정 단계에서는,
상기 결정된 변환 스킵 모드가 상기 수평 변환 모드인 경우,
상기 스캔 모드를 수직 스캔 모드로 결정하는 것을 특징으로 하는 영상 복호화 방법. - 제 10항에 있어서,
상기 스캔 모드 결정 단계에서는,
상기 결정된 변환 스킵 모드가 상기 수직 변환 모드인 경우,
상기 스캔 모드를 수평 스캔 모드로 결정하는 것을 특징으로 하는 영상 복호화 방법. - 복호화 대상 블록에 대응하는 영상 정보를 수신하고 상기 수신된 영상 정보에 대해 엔트로피 복호화를 수행하는 엔트로피 복호화부; 및
상기 엔트로피 복호화된 영상 정보를 기반으로, 복수의 변환 스킵 모드 후보 중에서 상기 복호화 대상 블록의 변환 스킵 모드(Transform Skip Mode: TSM)를 결정하고, 상기 결정된 변환 스킵 모드를 기반으로 상기 복호화 대상 블록에 대한 역변환을 수행하는 역변환부를 포함하되,
상기 복수의 변환 스킵 모드 후보는,
수평 변환과 수직 변환이 모두 수행되는 2D 변환 모드, 수평 변환이 수행되는 수평 변환 모드, 수직 변환이 수행되는 수직 변환 모드 및 변환이 수행되지 않는 비변환 모드 중에서 적어도 하나를 포함하는 것을 특징으로 하는 영상 복호화 장치. - 부호화 대상 블록에 대응되는 잔차 블록(residual block)을 생성하는 단계;
복수의 변환 스킵 모드 후보 중에서 상기 부호화 대상 블록의 변환 스킵 모드를 결정하는 단계; 및
상기 결정된 변환 스킵 모드를 기반으로 상기 잔차 블록에 대해 변환을 수행하는 단계를 포함하되,
상기 복수의 변환 스킵 모드 후보는,
수평 변환과 수직 변환이 모두 수행되는 2D 변환 모드, 수평 변환이 수행되는 수평 변환 모드, 수직 변환이 수행되는 수직 변환 모드 및 변환이 수행되지 않는 비변환 모드 중에서 적어도 하나를 포함하는 것을 특징으로 하는 영상 부호화 방법. - 제 14항에 있어서,
상기 부호화 대상 블록에 대응되는 예측 모드는 인터 모드이고,
상기 변환 스킵 모드 결정 단계에서는,
상기 부호화 대상 블록에 대응되는 예측 유닛의 형태를 기반으로 상기 변환 스킵 모드를 결정하는 것을 특징으로 하는 영상 부호화 방법. - 제 14항에 있어서,
상기 부호화 대상 블록에 대응되는 예측 모드는 SDIP 모드이고,
상기 변환 스킵 모드 결정 단계에서는,
상기 부호화 대상 블록에 대응되는 예측 유닛의 형태를 기반으로 상기 변환 스킵 모드를 결정하는 것을 특징으로 하는 영상 부호화 방법. - 제 14항에 있어서,
상기 부호화 대상 블록에 대응되는 예측 모드는 인트라 모드이고,
상기 변환 스킵 모드 결정 단계에서는,
상기 부호화 대상 블록에 대응되는 예측 유닛의 예측 방향을 기반으로 상기 변환 스킵 모드를 결정하는 것을 특징으로 하는 영상 부호화 방법. - 제 14항에 있어서,
상기 결정된 변환 스킵 모드를 기반으로 상기 부호화 대상 블록에 대한 스캔 모드를 결정하는 단계; 및
상기 결정된 스캔 모드를 기반으로 상기 부호화 대상 블록에 대한 스캐닝을 수행하는 단계를 더 포함하는 것을 특징으로 하는 영상 부호화 방법. - 부호화 대상 블록에 대응되는 잔차 블록(residual block)을 생성하는 잔차 블록 생성부; 및
복수의 변환 스킵 모드 후보 중에서 상기 부호화 대상 블록의 변환 스킵 모드를 결정하고, 상기 결정된 변환 스킵 모드를 기반으로 상기 잔차 블록에 대해 변환을 수행하는 변환부를 포함하되,
상기 복수의 변환 스킵 모드 후보는,
수평 변환과 수직 변환이 모두 수행되는 2D 변환 모드, 수평 변환이 수행되는 수평 변환 모드, 수직 변환이 수행되는 수직 변환 모드 및 변환이 수행되지 않는 비변환 모드 중에서 적어도 하나를 포함하는 것을 특징으로 하는 영상 부호화 장치.
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015012600A1 (ko) * | 2013-07-23 | 2015-01-29 | 성균관대학교 산학협력단 | 영상 부호화/복호화 방법 및 장치 |
KR20150011787A (ko) * | 2013-07-23 | 2015-02-02 | 성균관대학교산학협력단 | 영상 부호화/복호화 방법 및 장치 |
Families Citing this family (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102857755B (zh) * | 2011-07-01 | 2016-12-14 | 华为技术有限公司 | 确定变换块尺寸的方法和设备 |
CN107959857B (zh) * | 2011-10-18 | 2022-03-01 | 株式会社Kt | 视频信号解码方法 |
GB2518823A (en) * | 2013-09-25 | 2015-04-08 | Sony Corp | Data encoding and decoding |
US10405000B2 (en) * | 2014-11-21 | 2019-09-03 | Vid Scale, Inc. | One-dimensional transform modes and coefficient scan order |
EP3340632B1 (en) * | 2015-08-19 | 2021-08-11 | LG Electronics Inc. | Method and device for processing video signals |
US10042942B2 (en) * | 2015-10-30 | 2018-08-07 | Sap Se | Transforms using column dictionaries |
ES2817100B1 (es) * | 2016-03-28 | 2022-04-13 | Kt Corp | Metodo y aparato para procesar senales de video |
ES2908214T3 (es) * | 2016-06-24 | 2022-04-28 | Kt Corp | Filtración adaptativa de muestras de referencia para intra predicción usando líneas de píxeles distantes |
US11190770B2 (en) * | 2016-07-05 | 2021-11-30 | Kt Corporation | Method and apparatus for processing video signal |
WO2018044088A1 (ko) * | 2016-08-31 | 2018-03-08 | 주식회사 케이티 | 비디오 신호 처리 방법 및 장치 |
CN117412037A (zh) * | 2016-08-31 | 2024-01-16 | 株式会社Kt | 用于处理视频信号的方法和设备 |
CN114501006A (zh) | 2016-09-20 | 2022-05-13 | 株式会社Kt | 视频解码方法、视频编码方法和比特流解码装置 |
WO2019027241A1 (ko) * | 2017-07-31 | 2019-02-07 | 한국전자통신연구원 | 영상 부호화/복호화 방법, 장치 및 비트스트림을 저장한 기록 매체 |
KR102385399B1 (ko) * | 2017-08-04 | 2022-04-11 | 엘지전자 주식회사 | 비디오 압축을 위한 변환을 구성하는 방법 및 장치 |
CN110049322B (zh) * | 2018-01-15 | 2021-02-05 | 北京金山云网络技术有限公司 | 模式选择的方法、装置、电子设备及存储介质 |
WO2019194420A1 (ko) * | 2018-04-01 | 2019-10-10 | 엘지전자 주식회사 | 변환 인디케이터에 기반한 영상 코딩 방법 및 그 장치 |
FR3086485A1 (fr) * | 2018-09-21 | 2020-03-27 | Orange | Procedes et dispositifs de codage et de decodage d'un flux de donnees representatif d'au moins une image. |
KR20210057189A (ko) * | 2019-01-12 | 2021-05-20 | 주식회사 윌러스표준기술연구소 | 다중 변환 커널을 사용하는 비디오 신호 처리 방법 및 장치 |
US11418811B2 (en) * | 2019-03-12 | 2022-08-16 | Apple Inc. | Method for encoding/decoding image signal, and device therefor |
KR20220019257A (ko) * | 2019-07-10 | 2022-02-16 | 엘지전자 주식회사 | 레지듀얼 코딩에 대한 영상 디코딩 방법 및 그 장치 |
KR20220097520A (ko) * | 2020-01-10 | 2022-07-07 | 엘지전자 주식회사 | 변환에 기반한 영상 코딩 방법 및 그 장치 |
US20230036126A1 (en) * | 2020-01-10 | 2023-02-02 | Lg Electronics Inc. | Image coding method based on transform, and device therefor |
JP7451722B2 (ja) * | 2020-01-10 | 2024-03-18 | エルジー エレクトロニクス インコーポレイティド | 変換に基づく画像コーディング方法及びその装置 |
CN113709476B (zh) * | 2020-06-05 | 2022-12-23 | 杭州海康威视数字技术股份有限公司 | 编码方法、解码方法、装置及机器可读存储介质 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007516640A (ja) * | 2003-09-07 | 2007-06-21 | マイクロソフト コーポレーション | インターレース・ビデオの符号化および復号 |
JP2009194617A (ja) * | 2008-02-14 | 2009-08-27 | Sony Corp | 画像処理装置、画像処理方法、画像処理方法のプログラム及び画像処理方法のプログラムを記録した記録媒体 |
KR20090099234A (ko) * | 2008-03-17 | 2009-09-22 | 삼성전자주식회사 | 영상의 부호화, 복호화 방법 및 장치 |
KR20090129939A (ko) * | 2008-06-13 | 2009-12-17 | 삼성전자주식회사 | 영상 부호화 방법 및 그 장치, 영상 복호화 방법 및 그 장치 |
Family Cites Families (65)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2265089C (en) * | 1998-03-10 | 2007-07-10 | Sony Corporation | Transcoding system using encoding history information |
US20040125204A1 (en) | 2002-12-27 | 2004-07-01 | Yoshihisa Yamada | Moving picture coding apparatus and moving picture decoding apparatus |
JP4447197B2 (ja) * | 2002-01-07 | 2010-04-07 | 三菱電機株式会社 | 動画像符号化装置および動画像復号装置 |
US7620106B2 (en) | 2003-09-07 | 2009-11-17 | Microsoft Corporation | Joint coding and decoding of a reference field selection and differential motion vector information |
US7606308B2 (en) | 2003-09-07 | 2009-10-20 | Microsoft Corporation | Signaling macroblock mode information for macroblocks of interlaced forward-predicted fields |
US7623574B2 (en) | 2003-09-07 | 2009-11-24 | Microsoft Corporation | Selecting between dominant and non-dominant motion vector predictor polarities |
US8014450B2 (en) | 2003-09-07 | 2011-09-06 | Microsoft Corporation | Flexible range reduction |
US7577200B2 (en) | 2003-09-07 | 2009-08-18 | Microsoft Corporation | Extended range variable length coding/decoding of differential motion vector information |
US7369709B2 (en) | 2003-09-07 | 2008-05-06 | Microsoft Corporation | Conditional lapped transform |
US7092576B2 (en) | 2003-09-07 | 2006-08-15 | Microsoft Corporation | Bitplane coding for macroblock field/frame coding type information |
US7782954B2 (en) | 2003-09-07 | 2010-08-24 | Microsoft Corporation | Scan patterns for progressive video content |
US8625680B2 (en) | 2003-09-07 | 2014-01-07 | Microsoft Corporation | Bitstream-controlled post-processing filtering |
US7852919B2 (en) | 2003-09-07 | 2010-12-14 | Microsoft Corporation | Field start code for entry point frames with predicted first field |
US7724827B2 (en) | 2003-09-07 | 2010-05-25 | Microsoft Corporation | Multi-layer run level encoding and decoding |
US8345754B2 (en) | 2003-09-07 | 2013-01-01 | Microsoft Corporation | Signaling buffer fullness |
US8064520B2 (en) | 2003-09-07 | 2011-11-22 | Microsoft Corporation | Advanced bi-directional predictive coding of interlaced video |
US7822123B2 (en) | 2004-10-06 | 2010-10-26 | Microsoft Corporation | Efficient repeat padding for hybrid video sequence with arbitrary video resolution |
US8009739B2 (en) | 2003-09-07 | 2011-08-30 | Microsoft Corporation | Intensity estimation/compensation for interlaced forward-predicted fields |
US7577198B2 (en) | 2003-09-07 | 2009-08-18 | Microsoft Corporation | Number of reference fields for an interlaced forward-predicted field |
US8085844B2 (en) | 2003-09-07 | 2011-12-27 | Microsoft Corporation | Signaling reference frame distances |
US8107531B2 (en) | 2003-09-07 | 2012-01-31 | Microsoft Corporation | Signaling and repeat padding for skip frames |
US7317839B2 (en) | 2003-09-07 | 2008-01-08 | Microsoft Corporation | Chroma motion vector derivation for interlaced forward-predicted fields |
US7609762B2 (en) | 2003-09-07 | 2009-10-27 | Microsoft Corporation | Signaling for entry point frames with predicted first field |
US7688894B2 (en) | 2003-09-07 | 2010-03-30 | Microsoft Corporation | Scan patterns for interlaced video content |
US8213779B2 (en) | 2003-09-07 | 2012-07-03 | Microsoft Corporation | Trick mode elementary stream and receiver system |
US7839930B2 (en) | 2003-11-13 | 2010-11-23 | Microsoft Corporation | Signaling valid entry points in a video stream |
US8582659B2 (en) | 2003-09-07 | 2013-11-12 | Microsoft Corporation | Determining a decoding time stamp from buffer fullness |
US7567617B2 (en) | 2003-09-07 | 2009-07-28 | Microsoft Corporation | Predicting motion vectors for fields of forward-predicted interlaced video frames |
US7616692B2 (en) | 2003-09-07 | 2009-11-10 | Microsoft Corporation | Hybrid motion vector prediction for interlaced forward-predicted fields |
MXPA06002495A (es) | 2003-09-07 | 2006-06-20 | Microsoft Corp | Capa de porcion en codificador/descodificador (codec) de video. |
US7961786B2 (en) | 2003-09-07 | 2011-06-14 | Microsoft Corporation | Signaling field type information |
US7924921B2 (en) | 2003-09-07 | 2011-04-12 | Microsoft Corporation | Signaling coding and display options in entry point headers |
CN100401780C (zh) * | 2004-05-07 | 2008-07-09 | 美国博通公司 | 在视频解码器中动态选择变换尺寸的方法和系统 |
KR100619041B1 (ko) * | 2004-07-22 | 2006-09-01 | 삼성전자주식회사 | 비디오 동기화 장치 및 비디오 동기화 방법 |
CN101040533B (zh) * | 2004-10-13 | 2010-10-06 | 汤姆逊许可公司 | 复杂性可伸缩的视频编码和解码方法和设备 |
US20060104521A1 (en) * | 2004-11-15 | 2006-05-18 | Shu-Wen Teng | Image processing devices and methods |
CN1777283A (zh) * | 2004-12-31 | 2006-05-24 | 上海广电(集团)有限公司 | 一种基于微块的视频信号编/解码方法 |
KR100703770B1 (ko) | 2005-03-25 | 2007-04-06 | 삼성전자주식회사 | 가중 예측을 이용한 비디오 코딩 및 디코딩 방법, 이를위한 장치 |
KR100750145B1 (ko) | 2005-12-12 | 2007-08-21 | 삼성전자주식회사 | 영상의 인트라 예측 부호화, 복호화 방법 및 장치 |
CN101137047B (zh) * | 2006-08-29 | 2010-09-15 | 昆山杰得微电子有限公司 | 一种通过有效残差系数分析提高编码效率的方法 |
KR100927733B1 (ko) * | 2006-09-20 | 2009-11-18 | 한국전자통신연구원 | 잔여계수의 상관성에 따라 변환기를 선택적으로 이용한부호화/복호화 장치 및 그 방법 |
WO2008035842A1 (en) * | 2006-09-20 | 2008-03-27 | Electronics And Telecommunications Research Institute | Apparatus and method for encoding and decoding using alternative converter according to the correlation of residual signal |
EP2103147A4 (en) * | 2006-12-07 | 2011-01-19 | Qualcomm Inc | RATE CONTROL AND VIDEO COMPRESSION PER LINE |
CN101601300B (zh) * | 2006-12-14 | 2012-07-18 | 汤姆逊许可公司 | 用自适应增强层预测对位深度可分级视频数据进行编码和/或解码的方法和设备 |
US8488668B2 (en) | 2007-06-15 | 2013-07-16 | Qualcomm Incorporated | Adaptive coefficient scanning for video coding |
US8654833B2 (en) * | 2007-09-26 | 2014-02-18 | Qualcomm Incorporated | Efficient transformation techniques for video coding |
CN101415121B (zh) * | 2007-10-15 | 2010-09-29 | 华为技术有限公司 | 一种自适应的帧预测的方法及装置 |
KR101291196B1 (ko) | 2008-01-25 | 2013-07-31 | 삼성전자주식회사 | 영상의 부호화, 복호화 방법 및 장치 |
CN101309401B (zh) * | 2008-07-10 | 2010-08-04 | 上海富瀚微电子有限公司 | 一种快速的先进视频编码率计算方法及其装置 |
KR20100020441A (ko) | 2008-08-12 | 2010-02-22 | 엘지전자 주식회사 | 비디오 신호 처리 방법 |
KR20100027384A (ko) * | 2008-09-02 | 2010-03-11 | 삼성전자주식회사 | 예측 모드 결정 방법 및 장치 |
EP2382777A4 (en) * | 2009-01-27 | 2012-08-15 | Thomson Licensing | METHOD AND DEVICE FOR TRANSFORMATION SELECTION IN VIDEO CODING AND DECODING |
JP5700970B2 (ja) * | 2009-07-30 | 2015-04-15 | トムソン ライセンシングThomson Licensing | 画像シーケンスを表す符号化データストリームの復号方法と画像シーケンスの符号化方法 |
EP2299717A1 (en) | 2009-09-10 | 2011-03-23 | Thomson Licensing | Method and apparatus for image encoding using Hold-MBs, and method and apparatus for image decoding using Hold-MBs |
US20110090954A1 (en) * | 2009-10-21 | 2011-04-21 | Cohen Robert A | Video Codes with Directional Transforms |
US20110090952A1 (en) * | 2009-10-21 | 2011-04-21 | Cohen Robert A | Directional Transforms for Video and Image Coding |
KR101457894B1 (ko) * | 2009-10-28 | 2014-11-05 | 삼성전자주식회사 | 영상 부호화 방법 및 장치, 복호화 방법 및 장치 |
CN101710994B (zh) * | 2009-12-17 | 2012-12-26 | 无锡中星微电子有限公司 | 一种用于视频解码的方法和系统 |
US8315310B2 (en) * | 2010-01-08 | 2012-11-20 | Research In Motion Limited | Method and device for motion vector prediction in video transcoding using full resolution residuals |
US8885714B2 (en) | 2010-01-14 | 2014-11-11 | Texas Instruments Incorporated | Method and system for intracoding in video encoding |
US8559511B2 (en) * | 2010-03-30 | 2013-10-15 | Hong Kong Applied Science and Technology Research Institute Company Limited | Method and apparatus for video coding by ABT-based just noticeable difference model |
CN101841713B (zh) * | 2010-04-30 | 2012-12-05 | 西安电子科技大学 | 降低编码码率的视频编码方法及系统 |
CN101895756B (zh) * | 2010-07-15 | 2012-10-31 | 北京大学 | 视频图像块的编码、解码、重构方法及系统 |
US8494290B2 (en) * | 2011-05-05 | 2013-07-23 | Mitsubishi Electric Research Laboratories, Inc. | Method for coding pictures using hierarchical transform units |
GB2492333B (en) * | 2011-06-27 | 2018-12-12 | British Broadcasting Corp | Video encoding and decoding using transforms |
-
2012
- 2012-10-17 BR BR112014009403-9A patent/BR112014009403B1/pt active IP Right Grant
- 2012-10-17 KR KR1020147028577A patent/KR101857109B1/ko active IP Right Grant
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- 2012-10-17 CN CN201280061789.0A patent/CN104081775B/zh active Active
- 2012-10-17 KR KR1020147023493A patent/KR101550724B1/ko active IP Right Grant
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- 2016-12-15 US US15/380,801 patent/US9661346B2/en active Active
-
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- 2017-04-18 US US15/489,784 patent/US9826251B2/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007516640A (ja) * | 2003-09-07 | 2007-06-21 | マイクロソフト コーポレーション | インターレース・ビデオの符号化および復号 |
JP2009194617A (ja) * | 2008-02-14 | 2009-08-27 | Sony Corp | 画像処理装置、画像処理方法、画像処理方法のプログラム及び画像処理方法のプログラムを記録した記録媒体 |
KR20090099234A (ko) * | 2008-03-17 | 2009-09-22 | 삼성전자주식회사 | 영상의 부호화, 복호화 방법 및 장치 |
KR20090129939A (ko) * | 2008-06-13 | 2009-12-17 | 삼성전자주식회사 | 영상 부호화 방법 및 그 장치, 영상 복호화 방법 및 그 장치 |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015012600A1 (ko) * | 2013-07-23 | 2015-01-29 | 성균관대학교 산학협력단 | 영상 부호화/복호화 방법 및 장치 |
KR20150011787A (ko) * | 2013-07-23 | 2015-02-02 | 성균관대학교산학협력단 | 영상 부호화/복호화 방법 및 장치 |
CN105684442A (zh) * | 2013-07-23 | 2016-06-15 | 成均馆大学校产学协力团 | 用于编码/解码图像的方法和装置 |
KR101709775B1 (ko) | 2013-07-23 | 2017-02-23 | 인텔렉추얼디스커버리 주식회사 | 영상 부호화/복호화 방법 및 장치 |
KR101741037B1 (ko) | 2013-07-23 | 2017-06-15 | 인텔렉추얼디스커버리 주식회사 | 영상 부호화/복호화 방법 및 장치 |
KR101769427B1 (ko) | 2013-07-23 | 2017-08-18 | 인텔렉추얼디스커버리 주식회사 | 영상 부호화/복호화 방법 및 장치 |
KR101802957B1 (ko) | 2013-07-23 | 2017-12-05 | 인텔렉추얼디스커버리 주식회사 | 영상 부호화/복호화 방법 및 장치 |
KR101837040B1 (ko) | 2013-07-23 | 2018-03-09 | 인텔렉추얼디스커버리 주식회사 | 영상 부호화/복호화 방법 및 장치 |
CN105684442B (zh) * | 2013-07-23 | 2020-02-21 | 英迪股份有限公司 | 用于编码/解码图像的方法 |
US10645399B2 (en) | 2013-07-23 | 2020-05-05 | Intellectual Discovery Co., Ltd. | Method and apparatus for encoding/decoding image |
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